I like to call anger the red-headed stepchild of the emotions.
Anger gets such a bad rap. You know what I'm talking about. Anger gets marginalized.
Lots of people think they aren't angry (who are). Others think they're above being angry ("just be positive!"). Or anger is "unproductive" and "damaging" (it can be). Some people are openly angry all the time. And lots and lots of people are scared of anger, their own or other people's. Most people have some buried anger.
Some people are especially not allowed to feel angry. Kids, for sure. Women, often. People not in positions of power ... Pretty much all of us at some point in our lives.
Everyone gets angry though. The healthiest relationship with anger is being friendly with it because you know it has use. The purpose of anger, evolutionarily speaking, is protection of self. When in danger, anger wants you to get the hell out of Dodge, escape the saber-tooth tiger, or stop putting up with a bad situation.
People who are friendly with their anger are used to expressing it when the temperature is waaaay lower, so aren't in the habit of bottling it up, denying it, or feeling guilty about it. They also own it and take responsibility for it - instead of blaming other people for "making" them angry.
But a poor relationship with anger can cause us to see danger in many places when we are no longer at risk. (Trauma causes this.)
Unhealthy relationships with anger involve aggression, violence, intimidation, passive-aggression, depression, etc.
I like making room for people to talk about their anger. It just wants to be heard. Think of yourself as driving a car, and your emotions are the kids tumbling around in the back seat. Anger has something to say too. Let it talk. Then it will simmer down. And play nice with the other kids.